EXST 2201 MCKENNA EXAM QUESTIONS AND ANSWERS
WITH COMPLETE SOLUTIONS VERIFIED LATEST UPDATE
True or False
Statistics is the science of decision making using random selection of choices.
False
A shoes tore wants to know how much money, on average, their customers
spend each visit to the store. Using their store records, they draw a sample of
4,500 customer visits and record the amount spent at each customer visit. The
average of this data is calculated to answer the store's question.
What is the population in this example?
What is the sample in this example?
What is the variable in this example?
Population: All shoe store customer visits.
Sample: The 4,500 customer visits recorded.
Variable: The amount spent in the store at each customer visit.
At a birthday party, teams are chosen by putting everyone's name n a hat. Then
names are drawn to make up each team.
Is this sampling with replacement?
No
(False)
,At a local seminar, every attendee's name was put into a jar to win a small gift.
names were selected at random, the returned to the jar. This allowed the
possibility of an attendee winning more than one gift.
Is this sampling with replacement?
Yes
(True)
In a data set used in statistics (imagine a MS Excel Spreadsheet), information for
the variable are contained in the columns.
TRUE
In a data set used in statistics (Imagine a MS Excel spreadsheet), information
about the variables are contained in the columns.
TRUE
In a data set used in statistics (imagine a MS Excel Spreadsheet), information
about the individuals are contained in the columns.
FALSE
Randomly choosing several friends to go with you on a road trip would be what
type of sampling situation?
Random sampling of your friends without replacement.
A Gallup News Service sent out 2,000 questionnaires for survey about climate
change. 1,004 people responded to the survey and the other did not.
What type of statistical study is this survey?
This is an observational study.
What is the true and final, purpose of statistics?
,To get information from data to help make better decisions.
The average age of students enrolled in last Fall's engineering class was found to
be 24 years of age. What type of statistics does this statement describe?
Descriptive statistics
A confidence interval for the age of students enrolled in last years engineering
class was found to be (22,26) years of age. What type of statistics does this
statement describe?
Inferential statistics
The distribution of a column of data is given by its shape, location, and
symmetry.
FALSE
In a distribution of a column of data, a statistic for location measures where the
middle of the data values lie in a real number line.
TRUE
In statistics, the mathematical distance between two numbers is defined as:
Taking the difference between the two numbers.
In statistics, the statistical distance between two numbers is defined as:
Taking the difference between the two numbers, the dividing by the spread of the data.
It is known that the science of statistics can determine the relationship between
two variables, but that it cannot determine if one variable causes the values in the
second variable, What concept makes this statement true?
The concept of a lurking variable.
The first steps in doing statistics is alway?
, Abstract information from the problem.
A distribution in a column of data refers to what three characteristics of the
column of data?
The shape, location, and spread of the column of data.
What Characteristic is summarized by the pattern of the data values when
graphed?
Shape
What characteristic is summarized by the middle of the data values on a real
number line?
Location
What characteristic is summarized by the width of the data values on a real
number line?
Spread
The science of statistics summarizes information in a column of data with grass,
numbers and computer outputs.
FALSE
What information is extracted from a column of data by graphs?
General trend of the data values as well as any major exceptions.
Always look at your data first, before looking at your statistics.
TRUE
Data summarized by
Number of Data values:
WITH COMPLETE SOLUTIONS VERIFIED LATEST UPDATE
True or False
Statistics is the science of decision making using random selection of choices.
False
A shoes tore wants to know how much money, on average, their customers
spend each visit to the store. Using their store records, they draw a sample of
4,500 customer visits and record the amount spent at each customer visit. The
average of this data is calculated to answer the store's question.
What is the population in this example?
What is the sample in this example?
What is the variable in this example?
Population: All shoe store customer visits.
Sample: The 4,500 customer visits recorded.
Variable: The amount spent in the store at each customer visit.
At a birthday party, teams are chosen by putting everyone's name n a hat. Then
names are drawn to make up each team.
Is this sampling with replacement?
No
(False)
,At a local seminar, every attendee's name was put into a jar to win a small gift.
names were selected at random, the returned to the jar. This allowed the
possibility of an attendee winning more than one gift.
Is this sampling with replacement?
Yes
(True)
In a data set used in statistics (imagine a MS Excel Spreadsheet), information for
the variable are contained in the columns.
TRUE
In a data set used in statistics (Imagine a MS Excel spreadsheet), information
about the variables are contained in the columns.
TRUE
In a data set used in statistics (imagine a MS Excel Spreadsheet), information
about the individuals are contained in the columns.
FALSE
Randomly choosing several friends to go with you on a road trip would be what
type of sampling situation?
Random sampling of your friends without replacement.
A Gallup News Service sent out 2,000 questionnaires for survey about climate
change. 1,004 people responded to the survey and the other did not.
What type of statistical study is this survey?
This is an observational study.
What is the true and final, purpose of statistics?
,To get information from data to help make better decisions.
The average age of students enrolled in last Fall's engineering class was found to
be 24 years of age. What type of statistics does this statement describe?
Descriptive statistics
A confidence interval for the age of students enrolled in last years engineering
class was found to be (22,26) years of age. What type of statistics does this
statement describe?
Inferential statistics
The distribution of a column of data is given by its shape, location, and
symmetry.
FALSE
In a distribution of a column of data, a statistic for location measures where the
middle of the data values lie in a real number line.
TRUE
In statistics, the mathematical distance between two numbers is defined as:
Taking the difference between the two numbers.
In statistics, the statistical distance between two numbers is defined as:
Taking the difference between the two numbers, the dividing by the spread of the data.
It is known that the science of statistics can determine the relationship between
two variables, but that it cannot determine if one variable causes the values in the
second variable, What concept makes this statement true?
The concept of a lurking variable.
The first steps in doing statistics is alway?
, Abstract information from the problem.
A distribution in a column of data refers to what three characteristics of the
column of data?
The shape, location, and spread of the column of data.
What Characteristic is summarized by the pattern of the data values when
graphed?
Shape
What characteristic is summarized by the middle of the data values on a real
number line?
Location
What characteristic is summarized by the width of the data values on a real
number line?
Spread
The science of statistics summarizes information in a column of data with grass,
numbers and computer outputs.
FALSE
What information is extracted from a column of data by graphs?
General trend of the data values as well as any major exceptions.
Always look at your data first, before looking at your statistics.
TRUE
Data summarized by
Number of Data values:
